3D FlipBook - Flipbook is frozen on the front page and it does not flip at all

I have used the 3D flipbook plugin for many years. This time, however, it does not want to play nice. I was behind a maintenance front, and I thought that might cause the problem and brought the site out of maintenance mode with no change. I have created 4 different flipbooks, and all 4 show the front page, and unless I auto-play it, it does not flip, and even with auto-play, it only shows the last page and no pages in between. I have disabled all plugins, and still 64-page flipbooks only on auto-play show only the front and last pages. Any help would be greatly appreciated.